I ran WinFocus, and it wasn't what I expected. I thought the "brightness" of background windows would change, not the opacity. OK, I have no idea how that would be done, but they're still two different things.
I found using WinFocus unbearable. My graphics performance (not surprisingly) decreased tremendously, and figuring out what was what became extremely difficult. I'd see a couple of task bar buttons, and a couple tray icons (apparently, the ones that redraw themselves) but not the rest. It was difficult to tell which window was on top of another, and therefore difficult to tell what would happen if I clicked in a certain place. Basically, everything about the system was a usability nightmare.
I'm not trying to be negative, but opinions were requested. Bear in mind that I have always hated translucency in Windows XP, have never used it, and never will. And of course, I'm not the one who requested this application.